Chuck.



V. J. WAHLSTROM.

CHUCK.' APPLICATION FILED 0OT.1, 1910.

996,953, I Patented July 4, 1911.

' i tid BERNHARD T. BURCHARDI,

F BROOKLYN, NEVI YORK.

CHUCK.

Specification of Letters Patent.

Patented July 4., 191 i.

Application filed Gctober 1, 1910. Serial No. 584,799.

ivrith'these and other objects not specifi@ cally mentioned in view, theinvention consiste in certain constructions und combina.- tie s whichwiil he hereinuttei.' fully de- =i ,d rind then speciiicolly ,pointedout in the claims hereunto appended.

.in the accompanying drawings which 2e torni :i port ot thisspecification and in which like chzU-ncters ot reference indicate thesaine perts, Figure i is :i central seetioinii i'iew ot' :i deviceconstructed in :1ccm'dzinee with the invention, Fig. 2 is n.

seetionui views teken on the line 'dwg in Fig. l, si'iowing the jaws indifferentpbsitions, Figs. 5 :ind t3 are pien views ot' one so oiij'hejaws showing the parts in ditterent positims, Fig. 7 is :i sectionalview taken on the line 7--7 .in Fig. 5, and Fig. 8 is an end elevationof the jew shown in Figs. 5, 6 miei it. v

n the device selected to iliustrnte the invf ition, there is provided :ibody S) having e rudizil siots l0 cut through its well. to trui aperture'il adapted to receive e shank. The body is 'further provided shunk 12,driven or otherwise fasflevice to n. driil press or other n'ihchinefurther provided with 13 surrounding the body thereon. rlfhis sheil isprointernei eem feces 1i, and vion by ineens of two cops 15, 4ric shelland engaging rnbbets on the body 9. A spring 19 sectionui view taken onthe line 2--2 in 1 `ig. 1. with the shank omitted, Figs. il und tfireAled therein., for the purpose ot attachingf4 is coiled around tliebody'within the shell, one end being fast to the, body and the other tothe shell," :is indicated in Fig. l.

Thotportionof the device so fur described is old and well known in thenrt., und :i more detailed description of its construction deemedunnecessary to n full umlerstni'ulingif of the present invention, and istherefore omitted in the interest of brevity.

For the purpose ot clamping :1` tool in the centrul aperture 1l, thereis provided n j uw, or plurality of jaws, working in the slots 10. lThisinw or these jaws may vary `within wide limits. .As shown, however,v

jaws Q0 nre provided, euch jaw having :i fiat face 2l on its outer end,and :1. 'recess Q9, on its inner end the purpose ofwhich willbehereinufter explained. y

For the purpose oic producing.,r n movement of the jaw toward thir axisof the shell und center ot' the device, there is provided a wedgeinterposed between the jaw and one of the internul com trices it, :1ndthis Wedge muy vary within wide limits. in certain constructions withinthe invention for instance, :i roller mightI be employed for thispurpose. As shown, however, a wedge 23 is ei'ru'iloyed, this wedgehavingr a. flat fece 24 engaging the renr face 21 oli' the jaw and :1.curved 'Puce Q5 engaging the internal cam fece 14. `When thei'shell 13is rotated by' the spring 19, the internal cani face 14 slides by thecurved tace of lthe wedge and forces it inward toward the center of thechuck.. During this movement,` the fiat face Q4 of the wedfey slides onth atlat face 21 of' the jaw. Owing to the angle at which these facesare out, n smal-l radial movement, produced by the internal com falce,is translated into a relatively large radial movement of the jaw towardthe center of the chuck. This can be best understood by reference toFigs. 3, and 4. In Fig. 3, the jaws are shown in Wide open position andready to receive between them a drill shank of the largest size Within`the capacity of the device. i ln Fig. 4, the jaws are shown in theirinner, or closed position on a very snnilt drill shanln "While, incertain constructions, the jaw might be relied upon to clamp the toolshank vby direct contact; inthe best constructions t and as shown, atool gripper carried by the jawis employed. This gripper, marked 26, isa segmental rocking gripper and is seated in'therecess 22 of the jaw, asclearly shown in Figs. 3 and 4. It is provided with fingers 27 whichinterlock with fingers 28' on the jawQO. The bearing face 29 of eachgripper is cam shaped so that the grippers are, by contactwith a toolshank, caused to tightly clamp a tool shank in the aperture l1 in a wellknown manner.

i -The upper ,and lower ends of the jaws 20 yare provided withsegniental` channels 30- gether. For the purpose of holding each gripperin open or inoperative position, a

spring 33 is provided. One .end of this spring is secured in the jaw andthe othei.1` end in the gripper, Figs. 5 and 7. IVhen a plurality ofjaws and griiippers are employed, eachl gripper is provide with anupwardly projecting stud 34 which vengages one of the slots 35 cnt inthe lower face of a plate 36 centrally located in the upper part of theaperture l1. The mechanism just described serves to control the rockingmovement of the several grippers and insure uniform `movement of thesame so that a tool shank lwill always be centrally clamped in theaperture.

In view of the foregoing, a detailed description of the operation of thedevice 1s deemed unnecessary and is therefore omitted in the interestof'brevity.

Changes and variations may be made in the structure by means of whichthe invention is carried into effect. The invention, therefore` is notto be restricted to the pre- `cise details of the structure shown anddescribed.. f

W'hat is claimed is:

1.1In a chuck, the combination'with` an annular shell having an internalcam face, of a jaw movable toward the axis of the shell, a floatingwedge interposed between the cam face and the jaw,A and a tool grip percarried by the jaw. j

2. In a chuck', the :oinbination with an annular shell having. aninternal cam face, 0f

a jaw movable toward the a'xis of the shell,

a floating wedge interposed between the cam face and the jaw, and arocking tool gripper carried by the jaw.

3. In a chuck, the combination with an annular shell having an internalcam `face, of a jaw movable toward the axis of the shell, a fioatingwedge interposed between the cam face and the jaw, and a rocking toolgripper pivotally carried by the jaw.

4. In a chuck, the combination with an annular shell having an internal4cam face, of a jaw movable toward the axis of the shell, a floatingWedge interposed between the cam face and the jaw, a rocking toolgripper, and a pair of annular caps engaging the ends of the jaw andgripper to pivotally:

hold them together.' j

5. In a chuck, the combination with an annular shell'having` an internalcamy face, of a jaw movable toward the axis of the shell, a floatingwedge interposed between and arranged to slide on the cam face and `thejaw, and a rocking tool gripper carried -by the jaw.

6. In a chuck, the combination withan annular shell having a pluralityof internal cam faees,'of a plurality of jaws movable toward the axis ofthe shell, a plurality of oatingwedges interposed between the cam facesand the jaws, a plurality of rocking tool grippers one carried by eachjaw, and means connecting the grippers whereby uniformwmovement of thesame is controlled.

7. ,In al chuck, the combination with an annular shell having aplurality of internal cam faces, of a plurality of jaws movable towardthe axis vof the shell, a plurality of floating wedges interposedbetween the cam faces and the jaws, a plurality of rocking tool grippersone carried by each jaw and each provided with a4 stud, and meansengaging the studs whereby uniform movement of the grippcrs iscontrolled.

8. In a chuck, the combination with an annular shell having a pluralityof internal cam faces, of a plurality of jaws movable toward the axis,of the shell, a plurality of fioating wedges interposed between thecani faces and the-jaws, a 'plurality of rocking tool grippers'onecarried by each jaw and each provided with' a stud, and a plate hav'-ing a series of slots engaging the studs whereby uniform movement of thegrippers' is controlled.

9. In a chuck, the combination with a movable jaw, of a rocking toolgripper, and a pair of-annular caps engaging the ends of the jaw andgripper to pivotally hold them together.

10. In a chuck, the combination with an annular shell having an internalcam face, of a jaw movable toward thel axis of the shell, and a floatingwedge interposed between the cam face and the jaw and having a flat faceengaging the jaw and a curved face engaging the cam face.

11. In a chuck, the combination with an annular shell having an internalcam face, of a jaw movable toward the axis of 1die shell, a floatingwedge interposed between the aw and cam Aiucc, and a segmental toolgripper pivotally carried by the jaw.

12. In a chuck, the combination with an In testimony whereof, I havesigned my` annular shell having an internalcam face,of' name to =thisspeeication in thepresence a jaw movablel toward the axisof the shell,of two subscribing Witnesses.

a Hoating Wedge interposed between the jaw VERNER J. TNAHLSTROM. 5 andearn face, and a segmental tool grip` VitneSSeS:

er interlocked with and p'votally carried J. D. H. BERGEN, y the jaw.

H. OTTO CLAUSEN.

